20508876511 has 2 divisors, whose sum is σ = 20508876512. Its totient is φ = 20508876510.

The previous prime is 20508876503. The next prime is 20508876533. The reversal of 20508876511 is 11567880502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20508876511 - 2³ = 20508876503 is a prime.

It is a super-2 number, since 2×20508876511² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20508876581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10254438255 + 10254438256.

It is an arithmetic number, because the mean of its divisors is an integer number (10254438256).

Almost surely, 2^20508876511 is an apocalyptic number.

20508876511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20508876511 is an equidigital number, since it uses as much as digits as its factorization.

20508876511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 43.

The spelling of 20508876511 in words is "twenty billion, five hundred eight million, eight hundred seventy-six thousand, five hundred eleven".